Planograph



M. KRAUTAND F. B. KOLLBERG.

APPARMUS FOR AERATING LIQUID.

Patented Oct. 21, 1919.

2 SHEETSSHEET I.v

M, m w y 11 mw fi m 5W x 4 APPLICA'HON' HLED NOV. 8. I916.

Patent/ed Oct. 21, 1919.

2 SHEETS-SHEET 2- M. KRAUfAND F. a. KOLLBERG. APPARATUS FOR MERATING LIQUID.

- mnipf "eiem n w w ,7 2:21

TofatZ whom time? ooncem: L Be itknownthat we'g 'FREDERIGK B. K01311- BERG; residing at-r LBiSHee', "in the eounty of Coehise, State of A rizonai ahd Mex Kmw', resifliiigiat fiilgeleg in the county fof Dos Axjgeles, State 7 of }alifornia; both: citizen 0f th United States ef Amenfce, have invented new and ueeflil Improvements in Apparatus fei' lhei f'atirig Liquiii;=efWhieh the'afl'ethinggehamhen 3+an-thempp0sitemm ermechineje in discharge: pipe, 7 not :shown, through V which: tailings are dis-L 1 processesi A It is? an object "(if this in'ventin tb prej vicle an aeration meane for p o glucirige froth with a mipimnm dfeiiergj i Hel etoforef Hamid l agitatlon of pulp I in flotation "inac'hines. meme "ph'rposeof producing e; fi'eth hEaS Heehi veryinefieient, because ofiftherwastage 6f efier y ihlmoving' the 11111 about withoitteeeoniplislfing the entraining of any great a iriqui'it of air.

" means (if Our ap" "aratne iz veg'expo'se a maxi mum of surface 01 the 'to' the air, I in trod'uce the air intb a p s age, more the p 1 over the air,therehy bubbles, j meve the buieblee angl pulpf the pas sage.

r a th er f e m e e eeeid eeaee n r section through the a V The afi i atus'"hei einhegcgibed ie 'fthefgifi P ates-sm le eetg m rjp In the raw n F ee tran syer's'e eectionf I threhglg ch mb r ti h a petite-e Fig 2', isf'a d ta l t bne :El t d:'sebetent eliylmi n 1e aeration Q ehamher' '1 is mounted} jn a'sn t able siipporting 'framewdrk 2; xtendmg ee e itfiee v 'illliziveiniaer a,tam.hema-mntdsogbafi w aleng tihe; 31367 of fla he ll ariiileuh-e etantlally tie-extensive thenewith,1is a, froth mg chem-hen .01: .b0x13, which isv open an its upper 'side andr pnowidedmvith an inclined;

bottom 4. Goml unicatingamithz.theiheiad end .of the ia eratlrm chamber I iSAanQentranemopenmg on paesage5, through; which the pulp tOirbB treated his. iIItI'OdHQBdC H Q said a hemhelze 'ilzomthe bottqmof;

tail end of chargedw'l; a;

Formedain ene'sitie jacent the-upperi edge thereofnend extending;

longitudinally theref is an aeration chain:

communicates. at, its lower ehamberfi asshowne Viki-ranged. below; the Y toner em}! (if 7 is5a;;baifle board '01- fiaazgeifi which serves to defleetthepalp discharged through saidpassage butwardlyii leading frbmthebet tom- ;0f the frething chamber 3 tef the hate tom ofethe 'aeration. chamber 1. are spaced return openings: 9 which are omitr'elled by a sliding gatelO having 'a notehed lower edge toieorrespond with said openingsa- K Arranged in the iaemtionz ehamben the eei'ation element 01*? drumsall. taSaidQ ebnei st dfi a eylingirieailwall 12 which 1is belted aisrsh'ownto spiders 13 fixed to a shaft 14 extending central-1y through the aerationehamber andhaving'its end suitably meulited in" bearings prevailed: at: ithe end'qfl-saigi lchamheix Air--may freely cfir-u cuiate threugh thedrilm arounfl thespider armafThe cylindl ical wall 12 is provided with pefiferations 1 5 which; 1 exteni there; thi-bngli and eenamunieate with the interien 0f the The peifiplrfenyneflthe wallifi isf pref rably iiifighfiliieds by arranging there an a enmity eelesel emcee longitedi '1 nsilly= extending riflles 16= as shofir'nl in Fig; 2a; The times T6 serv to um air theree hetween and packet i-holdthe same while the piilp thereov'er. In-Fig.8 the-air is; held by rietional contaet with the surijfijheflr im and the pulp slipstlieret Prt'i't itl" Tiff thfe ehambei- If at the lower eti'ge bf the' outlet opening 6 is' an inwardly prbjeetirfg flange 1-7i which 'serves- 196- direct terior of the drum throughtoward said outlet opening the thin sheet of pul eentrifugally thrown from the area: 7 7 w r f j the pulp, into the passagel, It

moves downwardlyfinto the 'f'rofliiiig, he

tioncdrum. Communicating with the a ps; end of the aeration chambecis a; liiriall it of air suppl pipes 18, passage t rough which is control ed by valves 19. Arranged so arran d'tliatthe air which Is supplied to the c amber 1 will be introduced into said chamber and adjacent the periphery of the aeration element tangentially thereto and in a direction toward the outlet opening 6. The thin sheet of pulp thrown from the aeration drum induces air from pipes 18 increasing theaeration of the pulp. Oil supply ipes 21 are employed, eommunicating with the interior of the chamher, and are controlled by valves A casing 23 is spaced from and about the rear portion of the drum 11 as indicated in Fig. 1; thereby providin an aerations ace '24 of arcuate section 1; rough which 'epulp travels and in which it is aerated. The casi 23 at its lower part is extended to the cor of the aeration chamber in a direction tangential to the aeration drum. This construction assists in the direction of pu?) to the inlet of the aeration space.

n operation the aeration drum 11 isrotated at a suitable speed. The pul level inside the aeration chamber is maintained by means of the ate 10 at sucha height that the outer sur ace of the aeration drum is slightly immersed in the pulp, the latter being slightly higher than a tangent tothe lower surface 0 the drum. The level is maintained just suflicient to [ill the entrance to the aeration space 24. A greater height is not desirable as agitation and beating of the pulp will result. This is ineffective inproducmg aeration and results in a loss of power. Excessive beating of the pulp may also result in cmul'sification'which is found to be undesirable. I

'In the rotation of the drum the adhesion of'the pulp to the drum causesa flow-of the pulp at high velocity through the aeration space 24. This produces a high. velocity head and a low pressure head, the' pressure head decreasing with the increase of velocity head. "By imparting suflicient velocity to the pulp the pressure head maybe decreased; to less than atmosphere pressure, andai-r in-' duced through the perferations l. It will be noted that air may wadilfenter;. tl1e me hollow drip cups at each end 'of'the chamber 1. Airfis thereby introduced into the pulp and. comingled therewith. Aeratedpulp is thrown; oil the surface of the drumat-the. upper end of casing 23, due to the centrifugal action and encounters the apron 17, heingdirected thereby into the outlet-opening 6 air is also induced through the pipe 18 into the aerating chamber, mixing with the pulp asit is thrown from the drum.

her. The froth overflows from thetop of the frothin chamber carryin with it minin chamber 1 below the lower end of the. air supply. pipe .18 is a deflecting board 20 oral, and t e sinks to t e bottom for retreatment on return through opening 9 to the air chamber.

In mechanically actuated flotation machines especially of the horizontal type, bear ings are necessary for the shaft carrying the agitators. These bearings, when below the level of the pulp, mustbe packed .to prevent the. pulp from leaking therethnough. Due tethe sand and othergritty material inthe pirl the bearings and shaft rapidly wear an must be repaired and replaced. Our. machine is not subject to such diificulty, as the bearings for the aeration drum shaft are not in contact withthe pul In the operation device shown herein, air is induced through perforations 15, the surface of the thin stream of pulp which is moved by the drum through passage 24, because of adhesive and viscous action. There is a slippage of pulp relative to the drum, and the air enteringthepassage slips along the surface of the drum pocketing itsel between riflles 16 in the preferred form of drum, or being held by the frictional action of cthe drum surface in the modified form, shown in Fig. 3. While held thus, the pulp draws a film thereover and bubbles are formed. The ulp and bubbles are then carried by the! rum to the discharge exit of the passage 24and thrown from the drum throu 11 opening 6 into the frothing chamber. his machine does not depend upon agitating the pulp, as a very slow rotation of the drum will result in aeration.

In Fig. 5 the pulp passing through aera tion space 24v islshown with air pocketed between the rifles 16, the relative movement of the pulpand, the wall 12 of the drum being indicated by arrows. The moving wall 1 2 carries the pocketed bubbles to the outlet/of .space 24 and discharges the pulp and bubbles in'the form of a pulp. rInFigQ 6 the air is drawn throu h perforations 15 intoj the scace 24, being eld by frictional contact w th wall 12. Bubbles are thus formed vand the pul and bubbles moved through space 24 to t e outlet.

,Whatwe claim is:

1. a flotation machine, the combination 5 of a moving wall having pockets on the surfacecanda relatively stat onary wall spaced therefrom formi a passage, said moving wall provided with perforations for the introductionof air to said' passage.

2. machine for aerating liquid, comprising a rotatable element, a casing forming therewith a substantially unobstructed passage, said rotatable element arranged for contact with a liquid in said assage to cause high velocity flow thereof y viscous and adhesive action thereof, and an inlet to said passage for aerating liquid.

3. A machine for aerating liquid, comprising a rotatable perforated drum, a cas- 111g forming therewith a substantially unobstructed passage, said rotatable drum arranged for contact with a liquid in said passage to cause a high velocity flow thereof by viscous and adhesive action thereof, air being admitted to said passage for aerating said liquid, throu h the perforations in said drum, and an in ct and outlet to said passage for the aerated liquid.

4. n a flotation machine, the combination of an aeration chamber, a rotatable drum therein, a casing spaced from and forming a partially cylindrical aeration passa and means establishing communication etween the atmosphere and said passage.

5. In a flotation machine, the combination of an aeration chamber, a rotatable drum therein Whose interior is open to the atmosphere, and a casing spaced from and partially encircling said drum forming a partially cylindrical passage or aeration space, said drum havin perforations establishing communication etween its interior and said aeration space.

In Witness that we claim the foregoing we have hereunto subscribed our names this 12th day of October, 1916.

FREDERICK B. KOLLBERG. MAX KRAUT.

coplel of this patent may he obtained for me cents each, by afldreuing the "Gommilsioner o1 mum, Washington, D. 6. 

